Metal-working machine and method



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- 1,615, 92 c.P.TbPHNG METAL WORKING MACHINE AND METHOD Filed Oct 5; 1923 19 Sheefs-$ht 19 Elwueutoz I @51 M abtmu g 2 Patented Jan. 25, 1927.

UNITED fiTATES Q IQE' CHARLES --TOPPING, OF NORTH TONAWANDA, NEW S50E11, rrSSI-GNQB T BUFFALO BOLT COMPANY, OF NORTH TOHAWANIDA, NEW YGBK. A 'CQRFORATION OF NEW YORK.

METAL-.WOB-K-ING MACHINE AND IVIILERIEIIOID.

Myy present invention is shown as cmbodied in a machine for making nuts, but it is 0bvious,that many of its features are applicable to other metal working opera- .tions.

'l he-machine is automatic in the performance of a-considerable number of successive ,operations and while thereis special interrelation and combination between the vari- 1 ous cooperating groups of elements,.certain of ,the features are capable of performing their special functions separately or in combinations where some of-the operations are omitted or some ofthem are performed by hand so that the machine is but partially au m tic,

Many ofthe features of operation are of particular advantage in connection with the (making of very-heavy nut blanks and concern punching, cutting-and trimming of the blan by successive. operations whereby the violence necessarily exercised upon the .heavyanetal is productive of the least possible distortion, thereby minimizing the powerand number of steps required for perfecting the;blank. Obviously, however, the ,methods ,which are so particularly advantageous for heavy material are ,also advantageous in connection with lighter material, 30 since the perfection of form and certaintyof operation of the mechanisms are quite as important for the smaller nuts as for the larger.

As a complete machine, oneof its, most 2&5 important features is I the ,general organization, whereby the machine, so to speak, stands on edge in such fashionthat all of its metalworking parts are readily and conveniently accessible from one side of the ma- 1U chine, which may becalled the face or front.

There arethus accessible, the piercing, cutoff 'dll'tl trim punches and dies, a rotary transfer mechanism and a turret indexing :ai'rierand the successive finishing tools. Even the automatic mechanism for feeding the bars or blanks to the machine though located on the reverseface ofthemacl'iine, ...are controllable from the front.

The 'face of the indexingturrct mechanismispreferably fully, cxposedby support ing; it in a single massive overhung; bearing located at the rearof the machine. Dispensing" withan outside bearing: at the front of the machine n1al-:,es the tools readily no sible for easy adjustment or replacement, although as a matter of fact the conveniences of the organization are such that if desired a front bearing/could be employed.

Q11 the other or rear faceofthe machine are readily accessible-all of the cams, shafts, pears and other machine elements whereby the successive,operatiug'parts are 'drivenin properly synchronizedrelation. i i These are all operated froma single source (of ,power by substantial connecting shafts, ,links, etc, whereby it is made impossible for the groups of mechanism to getfout of synchronism. i i i The novel groups of mechanism which are thus combined include the ,followiligz There isan intermittently operated roller feed whereby the ,bar is presented step by step to the piercing cut-off and trimmecha- ,nism. Inprior devicesof this sortthe inr mnant rotation hasv been accomplished by some form of pawl and ratchetmechanism. In practice is found that even when the ratchets are made with teeth as'line as practicable oreven when differential tooth ratchets and,multiplelpawls are used the leeway forlost motion before .a pawl engages its ratchet is too great and when the machine is used for various lengths feeds as where the same machine is successivelyemployed for larger and smaller nuts, the punch, cutoff and trim mechanisms have to be specially spaced; in order to insure perfect registry and accuracy of performance of each of thethree successive operations on thesame blank and there is also necessarily a slightly greater waste ofmaterial between successive blanks.

:I avoid these diiiiculties and secure a mathematical accuracy of reciprocating ,feed by dispensing with pawl and ratchet engagement and substituting therefor an auton'iatically operating friction clutch between the intermittent or oscillatory drive .member and the one-way-rotating rolls, these partsbeing organizedso that the friction clutch element is forced into positive nonslip engagement with the "feed roll mechanism, prior to the beginning of the feed stroke of the oscillatory driving element and is completely unclutched andthc rolls held stationary,.at the end of saidstroke and during the return stroke of the oscillatory drive mechanism. With this organization of parts itie possihleto, adjust the throwot 

